sshfs mounts cannot be browsed with mc

[mc-butler]

Important

This issue was migrated from Trac:

Origin	https://midnight-commander.org/ticket/4289
Reporter	basz (mc@….eu)
Keywords	sshfs, empty, browse

remote directory mounted with sshfs (FUSE) can be normally used from cmd-line, however it cannot be browsed with mc 2.8.26. the same mount point, on the same host, works fine with mc 2.8.22.

example steps to reproduce:

1. /etc/fstab mount looks like this:

   user@host:/mnt/remote/stuff  /mnt/stuff  fuse.sshfs 
    noauto,_netdev,user,transform_symlinks,identityfile=/path/to/key,default_permissions,uid=user,gid=user,allow_other,cache=no   0   0
   

2. docker run -it --rm -v /mnt/stuff:/mnt:ro debian:11

3. apt update && apt install mc

4. mc /mnt

directory will appear to be empty, even though ls on the same dir shows real content.

changing debian image version in step 2 from 11 to 10 allows to browse mountpoint's content as usual.

note that mc 2.8.22 is the default in debian:10 (buster - aka: oldstable) and mc 2.8.26 is the default in debian:11 (bullseye - aka: stable).

[mc-butler]

Changed by basz (mc@….eu) on Sep 8, 2021 at 19:19 UTC (comment 1)

+ LC_MESSAGES=C
+ mc -V
GNU Midnight Commander 4.8.26
Built with GLib 2.66.8
Built with S-Lang 2.3.2 with terminfo database
With builtin Editor and Aspell support
With subshell support as default
With support for background operations
With mouse support on xterm and Linux console
With support for X11 events
With internationalization support
With multiple codepages support
With ext2fs attributes support
Virtual File Systems:
 cpiofs, tarfs, sfs, extfs, ext2undelfs, ftpfs, sftpfs, fish
Data types:
 char: 8; int: 32; long: 64; void *: 64; size_t: 64; off_t: 64;
+ LC_MESSAGES=C
+ mc -F
Home directory: /home/user
Profile root directory: /home/user

[System data]
    Config directory: /etc/mc/
    Data directory:   /usr/share/mc/
    File extension handlers: /usr/lib/mc/ext.d/
    VFS plugins and scripts: /usr/lib/mc/
	extfs.d:        /usr/lib/mc/extfs.d/
	fish:           /usr/lib/mc/fish/

[User data]
    Config directory: /home/user/.config/mc/
    Data directory:   /home/user/.local/share/mc/
	skins:          /home/user/.local/share/mc/skins/
	extfs.d:        /home/user/.local/share/mc/extfs.d/
	fish:           /home/user/.local/share/mc/fish/
	mcedit macros:  /home/user/.local/share/mc/mc.macros
	mcedit external macros: /home/user/.local/share/mc/mcedit/macros.d/macro.*
    Cache directory:  /home/user/.cache/mc/
+ mc --configure-options
 '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--disable-option-checking' '--libdir=${prefix}/lib/x86_64-linux-gnu' '--runstatedir=/run' '--disable-maintainer-mode' '--disable-dependency-tracking' 'AWK=awk' 'X11_WWW=x-www-browser' '--libexecdir=/usr/lib' '--with-x' '--with-screen=slang' '--disable-rpath' '--disable-static' '--disable-silent-rules' '--enable-aspell' '--enable-vfs-sftp' '--enable-vfs-undelfs' '--enable-tests' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -ffile-prefix-map=/build/mc-xlv0ck/mc-4.8.26=. -fstack-protector-strong -Wformat -Werror=format-security' 'LDFLAGS=-Wl,-z,relro -Wl,-z,now -Wl,--as-needed' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'

[mc-butler]

Changed by andrew_b (@aborodin) on Sep 9, 2021 at 5:12 UTC (comment 2)

• Component changed from mc-core to mc-vfs
• Milestone changed from 4.8.28 to Future Releases
• Description edited

[mc-butler]

Changed by andrew_b (@aborodin) on Feb 5, 2022 at 10:59 UTC (comment 3)

This is a result of #3987. Now mc calls the rewinddir(3) when reads a directory. I think sshfs has a bug related to rewinddir(3). Disabling of sshfs's cache should help.

Small test program can be find here.

[mc-butler]

Changed by basz (mc@….eu) on Feb 15, 2022 at 20:08 UTC (comment 4)

yes, this appears to be a problem with sshfs. i've checked the linked program and indeed on "regular" directories, i get the same output for both reads, yet for sshfs-mounts first read is good, but the second one yields empty result. unfortunately disabling caching does not seem to help.

anyway - we can close this ticket. i'll followup with sshfs team.

thank you. :)

[mc-butler]

Changed by basz (mc@….eu) on Feb 15, 2022 at 20:33 UTC (comment 5)

ticket on sshfs:
libfuse/sshfs#278

[mc-butler]

Changed by andrew_b (@aborodin) on Feb 19, 2022 at 13:25 UTC (comment 6)

• Milestone Future Releases deleted
• Resolution set to invalid
• Status changed from new to closed

Thanks!